neph·e·line 
(nĕfə-lēn′, -lĭn) also neph·e·lite (-līt′)
(nĕfə-lēn′, -lĭn) also neph·e·lite (-līt′)n.
A mineral of sodium-aluminum or potassium-aluminum silicate, occurring worldwide in igneous rocks and used in the manufacture of ceramics and enamels.
[From Greek nephelē, cloud (because its fragments become cloudy when placed in nitric acid); see nebh- in the Appendix of Indo-European roots.]
neph′e·linic (-lĭnĭk) adj.